[patch] bug 15055 Add Unistd.h to OProfileWrapper.cpp

Add #include <unistd.h> to OProfileWrapper.cpp.   This provides the declarations for 'read' and 'close' that are otherwise missing, and result in 'error: <foo> was not declared in this scope'.

This matches the issue as reported in bug 15055 "Can no longer compile LLVM with --with-oprofile"





git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174661 91177308-0d34-0410-b5e6-96231b3b80d8